Improvement in steam-engine valves



UNITED STATES PATENT OEEIcE.

WM. S. COOPER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN STEAM-ENGINE VALVES.

Specification forming part of Letters Patent No. 58,039. dated September11, 1866.

To all whom it may concern.'

Be it known that I, W. S. COOPER, of Philadelphia, Pennsylvania,haveinvented an Improvement in Stop-Valves; and I do hereby declare thefollowing to be a full, clear, and exact description ofthe saine,reference being had to the accompanying drawings, and to the letters ofreference marked thereon.

My invention consists of a ring applied to the chest and spindle of astop-valve, substantially as described hereinafter, the said ring beingsuch that it will serve as a guide for the spindle during the operationof grinding the valve toits seat, and at the same time permitting thevalve to be withdrawn from the chest when necessary.

In order to enable others skilled in the art to make and use myinvention, I will now proceed to describe its construction andoperation.

On reference to the accompanying drawings, which form a part of thisspecification, Figures l and 2 are vertical sections of a stop- Valvewith my improvement, and Fig. 3 a scctional plan on the line l 2, Fig.2.

Similar letters refer to similar parts throughout the several views.

A is the valve-chest, which is, as usual, separated into the receivingand discharging chambers a and a by a partition, b. In the partition bis an opening, d, with a beveled edge adapted to the beveled edge of avalve, e, at the lower end of the spindlef, a portion of which hasscrew-threads adapted to similar internal threads in the tubular pieceB, through which the spindle passes, the said tubular piece screwingonto the annular projection h of the valve-chest. The tubular piece B issurmounted with the usual screw-cap z', within which is apacking-washer, j.

The above-described parts are similar to those of ordinary stop-valves,and will therefore require no minute description.

Considerable difficulty has been heretofore experienced in regrindingthe valve c evenly toits seat after it has become Worn, a (lifticnltywhich has been owing to the size of the opening through which the valveis admitted to the chest, this opening` being so much larger than thespindle that the latter is without a guide to maintain it in its properposition free from all lateral movement during the operation ofgrinding. This difculty I obviate by the improvement which I will nowproceed to describe.

In arecess in the top of the valve-chest, and within the projection h, Ilit a metal ring, m, which is conned between a ledge, a, in the saidchest and the lower end of the tubular pieceB in the manner bestobserved on reference to Fig. l. The opening in the ring is sufficientlylarge in diameter to admit and serve as a guide for the screwed portionof the spindle f, which is consequently maintained by the said rin g inits proper position during the operation of regrinding the valve e toits seat, the ring being so loose in its recess that it can be readilywithdrawn therefrom when the valve has to be removed from the chest.

I claim as myinvention and desire to secure by Letters Patent- Theguiding-ring m applied to the chest and spindle of a stop-valve,substantially in the manner described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WM. S. COOPER.

Witnesses:

OHAs. E. FOSTER, W. J. R. DELANY.

